JPS5989930A - Safety device for high-frequency heater - Google Patents

Abstract

PURPOSE:To obtain the safety device of a simple structure, certainly functioning, by rotatably fitting a hook spacer, operated by a door key and turning ON and OFF a micro-switch by its rotary movements, to the micro-switch so as to be engaged with a door hook mechanism. CONSTITUTION:A hook 4, a lever 6 and a switch mounting part 11 to fix a micro-switch 8 to it are monolithically molded with synthetic resin, and the microswitch 8 is inlaid into the mounting part 11. The above-mentioned lever 6 is constituted so as to rotate centering a support part A, and pushing the actuator 9 of a micro-switch 8 by a switch-operating part B, while the head part C of a lever 6 is pushed by a door key 3. When a door 1 is going to be opened, the hook 4 is moved upwardly as shown by the dotted line of a door key 3, and the switch lever 6 is moved as shown by dotted lines and the switch 8 is turned OFF.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a safety device for a high-frequency heating device, and provides a door switch safety device for a high-frequency heating device that is inexpensive, easy to use, and easy to mass-produce. It is something.

Conventional structure and its problems Conventionally, as shown in Fig. 1, when door 1 is closed, door 1
By using the door key 3 pulled downward by the spring 2 to push down the metal lever 6 supported by the lever shaft 5 on the hook 4, it is fixed to the frame 7 with machine screws 10. The structure was such that the actuator 9 of the microswitch 8 was actuated to operate the microswitch 8. Therefore, since it consists of several parts, there were many problems with malfunction. In addition, the lever 6 is a rigid body made of sheet metal and has low cushioning properties, so the impact force of closing the door 1 is applied directly to the microswitch 8, causing damage and wear to the actuator 9 of the microswitch 8, contact springs, etc. There are problems such as significant changes in operating force, which can shorten the life of the microswitch 8.

In the control circuit shown in FIG. 6, as a safety device for the power supply lance 11 that forms the oscillation circuit of the high-frequency heating device, a microswitch A12. B13 and microswitch A12. Power transformer 1 that generates radio waves when B13 has an abnormality such as contact welding or short circuit.
Before supplying power to 1, a microswitch 8 is provided to turn on the door/, -n:J, and the microswitch 12,
A short circuit is formed with 8.13 and fuse 14 or 0F
FL, there is no radio wave.

Therefore, it is the micro switch 12 that is linked to the opening and closing of the door.
, 13.8, and if any one of them is operated as shown in FIG. 1 by the door key 3, the microswitch φ8 will be in the three states shown in FIG. Therefore, each of them tends to have one problem that impairs the life of the microswitch 8 as described above.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to provide a safety device with a highly iI-productive structure and improve its durability.

Structure of the Invention In order to achieve the above object, the present invention d:
A door key provided on a door that opens and closes a door, a switch lever operated by the door key, a hook portion into which the door key appears, and a microsinch that is turned on and off by the switch lever. a switch fixing part that fixes the hook part and the microswitch; and a switch fixing part that turns on and off the micro switch with a rotatable spacer;
The rotating shaft is integrally formed with resin, making it highly suitable for mass production and has excellent durability.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2, 3, 4, and 5.

FIG. 2 is a diagram in which the door 1 is closed and the door key 3 is used to press the lever 6 to turn the switch 8 on.

In FIG. 2, a switch fixing part 11 fixing the hook 4, lever 6, and microswitch 8 is integrally molded with resin, and the microswitch 8 is fitted into the switch fixing part 11. The lever 6 uses the support part A as a fulcrum, and the switch operation part B operates the actuator 9 of the microswitch 8.
, and the head part C was shaped to be pressed with the door key 3. With this, the load required to operate the door key 3i micro switch 8 is approximately 70% of the load MI4, making the operation easier.

When trying to open the door 1, the door key 3 shown by the dotted line moves in three directions, the door 1 moves away, and the switch lever 6 becomes as shown by the dotted line and the switch 8 is turned off.

Next, the shape of the switch lever 6 will be described. A thinner part is formed near the fulcrum, and after passing the bent part F, it branches into a lever head C that comes into contact with the door key 3 and an operating part C that pushes the actuator 9 of the micro switch 8. Therefore, the movement of the door key 3 is extremely transmitted to A, but if you press it beyond a certain amount of movement, the lever on the head C will move further because there is a thin part on the side of the head lever C near the branching point G. Therefore, the impact on the actuator 9 is small and the durability of the microswitch is improved.

Further, since the thin wall portion is provided in areas other than the vicinity of the fulcrum A, the amount of movement of the thin wall portion near the fulcrum A is also small, and the thin wall portion H is also reduced. As a result, the repeated flexibility of the resin lever 6 when opening and closing the door 1 was significantly improved. Furthermore, by providing both thin-walled portions DH, the durability, restorability, and creep characteristics of the switch lever 6 itself are improved.

FIG. 5 shows an external perspective view with only the switch lever 6 taken out.

Next, the other microswitch 12 will be described.

In FIG. 2, the switch fixing part 15 that fixes the hook 4 and the micro switch 2, and the rotation center shaft 17 of the Nox spacer 16 are integrally molded with resin, and the micro switch 12 is fitted into the switch fixing part 16. , is constructed by including.

When the hook spacer 16 is inserted, as shown by the arrow in FIG. 3 in the partial sectional view taken along line 8-A' in FIG.
The letter-shaped protrusion 18 falls to the inside of the shaft 1A as shown by the dotted line, and when it is pushed further 2 times, the hook space +116
are engaged by L-shaped protrusions 18 to prevent them from falling off.

Therefore, in the assembled state shown in Fig. 4, it is possible to temporarily dock the unit and check the operation of the microswitch 12, making it a single-product unit. When fixing to (l
-L boss 18 integrally formed with rotation center shaft 1
7 and 2 places are fixed to the main body. Therefore, the main body and door 1. Door key 3 and hook 4. The door key 3 and the nox spacer 16 are each integrally molded 7, and the rotation center shaft 17 also functions as a boss for fixing the main body.
Since the dimensions can be stably fixed, the hook 4, lever 5, and switch fixing part 11.16. While the Nox spacer 16 is rotating, the U-axis 1a and the main body fixing boss etc. are integrally molded with resin, and the switch 8,
12, the safety device has a simple structure and reliable operation, is inexpensive, and has good durability.

Effects of the Invention According to the present invention, the following effects can be obtained.

(1) The lever has an extremely good buffering effect, and the impact force of closing the door is not directly applied to the switch, which prevents damage to the switch actuator and contact spring, and significantly reduces wear and tear on the switch, resulting in less change in operating force. The durability is improved.

(2) By integrating the resin, it has a double insulation structure.

(3) Since the number of component parts is 2 including the switch,
It has extremely good workability and can be manufactured at low cost.

(4) Of the s microswitches, two of them are molded with the same resin, and the switches are attached using the springiness of the resin, and the operating levers and hook spacers also utilize the elasticity of the resin. Since they are integrally molded or engaged, they can be easily fabricated without any adjustment, and can be manufactured at low cost with fewer components.

(5) % and 9 meat parts are provided in two places to improve the durability of the lever. ] The number of personnel will increase even further.

(6) If the basic idea of providing a bent part, a branched head and operating part, and two thin parts in the middle of the lever is followed, the shape of the door key, the size and shape of the two microsinches, etc.
It is a highly durable safety device with a flexible design that allows you to install it yourself depending on the current installation space.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional 1ul 1 side view showing a safety device of a conventional high-frequency heating device, and FIGS. 2 and 3 are a partially cross-sectional 1u view showing a safety device of a high-frequency heating device according to an embodiment of the present invention.
ll tar diagram, Figure 4 is the external appearance and perspective view of the lower part of the device,
FIG. 5 is a perspective view of the switch lever 6 of the device, and FIG. 6 is a circuit diagram of the control 111 of a general high-frequency heating device. 1...Door, 2...Spring, 3...
Door key, 4...Hook, 6...Lever (switch lever), 8...Micro switch, 9...
...Switch actuator, A...Support part,
B...Switch operation section, C...Head, D
......first thin part, H...second thin part,
F...Bending part, G...Branch point, 10...
...Machine screw, 12.13...Micro switch, 11...Power transformer, 15...Switch fixing part, 16...Funoku spacer, 17...
...Rotation center axis, 18...L-shaped protrusion. Name of agent Patent attorney Toshio Nakao and one other famous person 1 Figure 2 150- Figure 3 Figure 4/3 Figure 5 Figure 6

Claims (6)

[Claims] (1) A door key provided on the door that opens and closes the front opening of the heating chamber, a switch lever operated by the door key, a hook portion on which the door key appears, and a microscopy switch that is turned on and off by the switch lever. a switch lever, the hook portion, and a switch fixing portion for fixing the microswitch are integrally formed of resin, and the switch lever includes a head that contacts the door key and an operating portion for operating the microswitch. A safety device for high-frequency heating equipment that has two branches. (2) A hook spacer that is operated by a door key and rotates to turn on and off a microswitch is formed with a resilient slit-shaped claw on the boss at the center of rotation, and the hook spacer is rotatably engaged. A safety device for a high frequency heating device according to claim 1. (3) The scope of the patent claims that is formed by integrally molding the rotating shaft of the hook spacer, the switch fixing part that is turned on and off by the hook spacer, the switch fixing part that is turned on and off by the switch lever, the saw, etc. A safety device for the high-frequency heating device according to item 1. (4) A safety device for a high-frequency heating device according to claim 1, which serves as the rotating shaft of the hook spacer and at least one attachment portion to the main body, such as a switch fixing portion. (5) A safety device for a high-frequency heating device according to claim 1, in which the wall thickness near the fulcrum of the switch lever is made thinner, and the wall thickness is also made thinner at the contact portion for pressing the door key. (6) A safety device for a high-frequency heating device according to claim 1, wherein a bend is provided between the fulcrum of the switch lever and the branch point of the microswitch operating portion of the contact portion for pressing the door key.